radv: generate entrypoints for VK_ANDROID_native_buffer

Patch changes radv entrypoints generator to not skip this extension even
though it is set as disabled in the vk.xml

Reference: 63525ba7 ("android: enable VK_ANDROID_native_buffer")
Fixes: 69f44755 ("vulkan: Drop vk_android_native_buffer.xml")
Signed-off-by: Mauro Rossi <issor.oruam@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Reviewed-by: Robert Foss <robert.foss@collabora.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
(cherry picked from commit 1eb65c51)